Greenspan's comments regarding the deficit are both sobering and long overdue. I hope the Republicans are listening but I am not confident. We basically finance the deficit by selling T-bills to large institutional foreign investors. That helps keep the dollar strong against other currencies which helps those nations keep their exports high, primarily China and Japan. A sinking dollar would make their goods being sold here more expensive. The problem is that they can't do that forever, especially with our deficit getting worse and worse and worse. At some point they will stop buying those notes unless they are offered with a higher rate of return which means higher interest rates all around. That, of course, means less capital available for financing everything from a new home to a new factory. Further, that increases the part of our deficit that is essentially interest payments. It is the samething that happens when you minimum monthly payment on your interest card goes up, it costs you more to carry almost the same debt. The whole mess can spiral. A slower economy due to tighter capital markets produces less tax revenue leading to a higher deficit requiring more borrowing to keep it afloat leading to an even tighter capital market. And so on.
The only way to fix this is to lower the deficit and that can only be done two ways: A) muster the political discipline to raise taxes and lower spending or

a visit from the prosperity fairy, ie, an economy so prosperous that the increased tax revenue generated creates a surplus or close to it.
Some articles:
Fed Reserve Gov. Ed Gamlich on the Deficit Greenspan on the DeficitGamlich says the way out is "fiscal austerity" for the United States. I don't see it happening.
Politically, this is up to the President to deal with. He has another 4 years, majorities in the Senate and House and a pocketful of political capital. He needs to get it done, no excuses. I don't expect any President to waive an economic wand and fix global economies the world over with nothing more than a "bippity-boppity-boo". However, what can be done must be done. Some sort of demonstration of political discipline would go a long way towards calming the growing fears over our deficit. Greenspan, not known for hyperbole, is right, the situation is growing "increasingly less tenable".